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  I have done the same thing.  Until recently, I had two dogs and two cats and a lot of company.  Several times, one of my dogs or cats has been left in the basement (it's finished and people have been down there) -- and I haven't notice them gone until the next day...especially the cats, which are outside a lot. 
 And with a cat going out - a dog coming in - another cat going out - another dog coming in  (constantly) it can get confusing and I have several times left one of my dogs out longer than I meant to.
 
 My new little Yorkie is my first dog that can't go outside without me.  And, I suspect he is always going to have to be on a leash.  I have a safe back yard, but it is not fenced.  One side, is the state park and another side goes into a pasture (where my other dogs love to play).  But the Yorkie can't be let go like my other dogs can.  And, boy, I have already learned that he can run three times as fast as I can - and get through places that my size just won't fit through. (and - I am also afraid of the hawks in this area.)
 
 Anyway - I am sure all of our pets have accidently been left on the other side of a door occasionally.  But - now with a Yorkie - I really have to be careful and know where he is every minute.
 
 Good luck - Carol Jean
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